I was added a table options after `force: :cascade` in #17569 for not
touching existing tests (reducing diff). But `force: :cascade` is not an
important information. So I prefer to place a table options before
`force: :cascade`.

Use tt in doc for ActionView [ci skip]

Use tt in doc for ActiveRecord [ci skip]

Use tt in doc for ActiveSupport and Railties [skip ci]

Fix broken doc layout for action_view [ci skip]

Remove Active Storage duplicated classes from the API site

Since cb5af0d7, some classes that are under Active Storage are now
part of the API site.

However, these classes aren't nested under a definition of the
`ActiveStorage` module but rather name-spaced under it like
`ActiveStorage::Foo`.

Thus, these classes are present both under the ActiveStorage label
and at the root of the site's sidebar so we have to strip out
duplicates.

[ci skip]

Fix order of Active Storage DiskService URL parameters

`content_type` parameter is before `disposition` parameter.

Correct wording and adding info [ci skip]

I had to do some I was unsure what kind of caching it was performing, and had to do some Googling. Also improves the wording.

https://travis-ci.org/rails/rails/jobs/268599781#L784

Use tt in doc for action_pack [ci skip]

Fix `can't modify frozen String` error in `display_image`

Use tt in doc for action_mailer [ci skip]

Use typewriter in doc for Action Cable [ci skip]

Fix broken doc for Active Record [ci skip]

Without this, `display_image` raises an error as follwing:

```
RuntimeError: can't modify frozen String
    rails/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb:72:in `display_image'
    rails/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb:40:in `block (2 levels) in <class:ScreenshotHelperTest>'
```

Enable links in Active Storage docs [ci skip]

Add :nodoc: for ActiveRecord::AttributeMethods [ci skip]

Fix link in doc for active storage [ci skip]

This regression was caused by caa178c1. The block for
`set_inverse_instance` should also be passed to join dependency.

Fixes #30402.

Add paths to docs for Active Storage

Address `test_after_save_callback_with_autosave` failure

when other `AutomaticInverseFindingTests` load `:comments` fixture
but does not load `:posts`.

Refer #30385 for similar issue